Atomic Emission Spectra When a sample of gas is excited by applying a large alternating electric field, the gas emits light at certain discrete wavelengths. The intensity and wavelength of the light that is emitted is called the atomic emission spectrum and is unique for each gas. In this assignment, you will measure the emission spectra for several gases and then make some observations about the differences in their spectra. Start Virtual ChemLab, select Atomic Theory, and then select Atomic Emission Spectra from the list of assignments. The lab will open in the Quantum laboratory. The Spectrometer will be on the right of the lab table. The hydrogen emission spectra will be in the detector window in the upper right corner as a graph of Intensity vs. wavelength (l). How many distinct lines do you see and what are their colors? there were 4 different lines and there colors were pink, light blue, dark blue and orange-red Click on the Visible/Full switch to magnify only the visible spectrum. You will see four peaks in the spectrum. If you drag your cursor over a peak, it will identify the wavelength (in nm) in the xcoordinate field in the bottom right corner of the detector window. Record the wavelengths of the four peaks in the visible hydrogen spectrum in the data table. (Round to whole numbers.)